LLE for (water plus ionic liquid) binary systems using [C(x)mim][BF4] (x=6, 8) ionic liquids

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Filipa M. Maia (Autor) FEUP; Oscar Rodríguez (Autor) FEUP; Eugénia A. Macedo (Autor) FEUP

Revista

Título: Fluid Phase Equilibria

Vol. 296

Páginas: 184-191

ISSN: 0378-3812

Editora: Elsevier

Indexação

ISI Proceedings

ISI Web of Knowledge - 38 Citações

ISI Web of Science

Scopus - 44 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

ID Authenticus: P-003-2S8

DOI: 10.1016/j.fluid.2010.05.003

Abstract (EN): Liquid-liquid equilibrium diagrams were determined for (IL + water) systems using the family of ILs 1-alkyl-3-methylimidazolium tetrafluoroborates, where the alkyl groups are hexyl and octyl ([C(x)mim][BF4] with x=6 and 8). The gravimetric method was used to determine the equilibrium compositions at temperatures ranging from 278.15 to 340.15K. Both systems present an upper critical solution temperature (UCST), which increases from [C(6)mim][BF4] to [C(8)mim][BF4]. The experimental data were correlated using the NRTL and eNRTL models. The binary interaction parameters were calculated for each system and model, and good agreement between experimental and calculated equilibrium compositions was obtained. Finally, the apparent Gibbs energy, enthalpy and entropy of water solution in the ILs were calculated using a modified van't Hoff equation. The three thermodynamic functions were found to be positive for both ILs.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8